Table 2.

Deposition (DE) and Dispersion (H) data (Mean ± SD) for 2 μm-Diameter Particles

	DE, %		H, mL
Vp, mL	Air	Heliox	Air	Heliox
150	20.0 ± 7.6	15.8 ± 4.7	203 ± 27	206 ± 32
300	36.2 ± 7.2	35.2 ± 4.9	287 ± 25	274 ± 20
500	57.8 ± 8.9	61.0 ± 10.2	399 ± 36	365 ± 24

V_p, penetration volume.